中文摘要：

应用复合变幅杆及夹心式换能器结构，研制了一种指向性开角较大且发射电压响应较高的发射换能器。应用有限元方法对换能器的工作频率，发射电压响应及指向性进行了理论计算。并与实验结果进行了比较，结果较吻合。本文研制的换能器工作频率为75．6kHz，发射电压响应级达到156dB（基准值1V／μPa），-3dB发射指向性开角100°

英文摘要：

Transducer with large directivity and high transmitting sensitivity is designed and fabricated. It is a sandwich transducer with composite horn. On using the FEM method and the model of sandwich transducer, the frequency, the transmitting sensitivity and the directivity are simulated. The computation of models agree with the experimental. The maximum transmitting voltage response level of a sandwich transducer is 156dB（1V/μPa） and the directivity is up to 100°（-3dB） at the resonance frequency of 75.6kHz.